Sofa



FIG. 1 is a front view of the sofa;

FIG. 2 is a right side view of the sofa, the left side view being a mirror image thereof; and,

FIG. 3 is a rear view of the sofa.

FIG. 2 has been shown on an enlarged scale with respect to FIGS. 1 and 2. 

The ornamental design for a sofa, as shown and described. 